Which of the following is not an example of competitive inhibition?
1. Inhibition of succinic dehydrogenase by malonate
2. Sulpha drugs used to control bacterial pathrogens
3. Inhibition of alcohol dehydrogenase by ethanol in methanol poisoning
4. Inhibition of cytochrome oxidase by cyanide
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
53%
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Which of the following sets of coenzymes are nucleotides of vitamin niacin?
1. NAD, NADP
2. FMN, FAD
3. ATP, ADP
4. ATP, FAD
1. NAD, NADP
2. FMN, FAD
3. ATP, ADP
4. ATP, FAD
Subtopic: Enzyme Cofactors |
89%
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Which of the following is a cofactor for the proteolytic enzyme carboxypeptidase?
1. Zinc
2. Copper
3. Calcium
4. Magnesium
1. Zinc
2. Copper
3. Calcium
4. Magnesium
85%
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Which of the following groups of enzymes helps in catalysing a transfer of a group ( other than hydrogen) between a pair of substrates?
1. Oxidoreductases
2. Transferases
3. Lyases
4. Isomerases
1. Oxidoreductases
2. Transferases
3. Lyases
4. Isomerases
Subtopic: Enzymes Classification |
85%
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Which of the following factors can influence enzyme activity?
1. High temperature
2. pH
3. Substrate concentration
4. All of these
1. High temperature
2. pH
3. Substrate concentration
4. All of these
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
94%
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What would happen to Vmax' in presence of a competitive inhibitor?
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
1. Decreases
2. Increases
3. Remains the same
4. First increases then decreases
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
55%
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Study the following graph of concept of activation energy given below. Select the correct option for stages labelled A to D.
| A | B | C | D | |
| 1 | Transition State | Potential energy | Activation energy without enzyme | Activation energy with enzyme |
| 2 | Kinetic energy | Potential energy | Activation energy without enzyme | Activation energy with enzyme |
| 3 | Potential energy | Transition state | Activation energy without enzyme | Activation energy with enzyme |
| 4 | Potential energy | Transition state | Activation energy without enzyme | Activation energy with enzyme |
Subtopic: Enzyme Catalysis |
77%
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Enzymes work at optimum temperature. Over a rang 0 - 40oC, what would happen to the rate of enzyme controlled reactions for every 10oC rise in temperature?
1. The rate doubles itself
2. Decreases by half
3. No effect
4. First increases then decreases
1. The rate doubles itself
2. Decreases by half
3. No effect
4. First increases then decreases
Subtopic: Factors Affecting Enzyme Catalysis Reaction |
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Sugar that converts \(Cu^{2+} \rightarrow Cu^+\) during Benedict's test in not
1. Sucrose
2. Glucose
3. Fructose
4. Ribose
1. Sucrose
2. Glucose
3. Fructose
4. Ribose
Subtopic: Carbohydrates: Introduction |
53%
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You isolate an unidentified liquid ‘X' from a sample of beans. You add the liquid ‘X' to a beaker of water and shake it vigorously. After few minutes, water and the liquid ‘X' get separated into two layers where ‘X' floats on water. The unknown liquid ‘X' is most likely to be a/an
1. Enzyme
2. Protein
3. Lipid
4. Carbohydrate
1. Enzyme
2. Protein
3. Lipid
4. Carbohydrate
Subtopic: Lipids |
76%
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